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WASHINGTON -- U.S. President Barack Obama will begin laying out a strategy this week to defeat Islamic State militants in the Middle East, meeting with congressional leaders Tuesday and giving a speech to the American people on Wednesday, the eve of the 13th anniversary of the deadliest terrorist attack on U.S. soil.

Obama disclosed his plans during an interview broadcast Sunday on NBC television's "Meet the Press."

"I just want the American people to understand the nature of the threat and how we're going to deal with it and to have confidence that we'll be able to deal with it," he said in the interview conducted Saturday at the White House shortly after his return from a NATO summit in Wales where the Islamic State threat was a key topic of discussion.

Obama restated his opposition to sending U.S. ground troops to engage in direct combat with the militants, who have laid claim to large swaths of territory in Iraq, targeted religious and ethnic minority groups, and threatened U.S. personnel and interests in the region.

At Obama's direction, the U.S. military has conducted more than 130 airstrikes against Islamic State militants in Iraq in the past month. In retaliation, the group recently beheaded two American journalists it had been holding hostage in Syria, where the organization also operates.

Lawmakers have pressed Obama to expand the airstrikes into Syria. He has resisted so far, but said he has asked his military advisers for options for pursuing the group there.

In the interview, Obama said the U.S. would not go after the Islamic State group alone, but would operate as part of an international coalition and continue airstrikes to support ground efforts that would be carried out by Iraqi and Kurdish troops.

At the NATO summit, the U.S. and nine allies agreed to take on the militants because of the threat they pose to member countries.

"Clearly, he's put together a coalition of the willing -- we have heard that before -- to tackle this problem. That's good," said Republican Rep. Mike Rogers, chairman of the House Intelligence Committee.

At the same time, the president "needs to engage Congress, the American people, on what exactly we're going to do here," said Rogers.

Obama should make the case why the extremists are a threat to the U.S. and lay out the strategy, Rogers said. But, he said, "We need to have an endgame."

Democratic Sen. Dianne Feinstein wants to hear what the diplomatic and military parts of Obama's plan are.

"Time's a wasting, because we have now said that we're going to go on the offensive. And it's time for America to project power and strength," said Feinstein, who heads the Senate Intelligence Committee and joined Rogers on CNN's "State of the Union."

Obama's emerging strategy depends on the formation of a new government in Iraq, as well as co-operation and contributions from regional partners, including Saudi Arabia, Jordan and Turkey. Obama said he expected the new Iraqi government to be formed this week.

"What I want people to understand ... is that over the course of months, we are going to be able to not just blunt the momentum of ISIL," he said, using an alternate name for the group. "We are going to systematically degrade their capabilities. We're going to shrink the territory that they control. And ultimately we're going to defeat them."

The head of the Arab League, Nabil Elaraby, appealed to its member states to confront "militarily and politically" the Islamic State insurgents. Support from the Arab League could provide Obama with the international coalition he hoped to create.

It wasn't immediately clear what steps the Arab League might take.

Elaraby said Sunday in Cairo that what is needed from Arab countries is a "clear and firm decision for a comprehensive confrontation" to what he called "cancerous and terrorist" groups.

Obama said his administration has seen no intelligence that suggests an immediate threat to the U.S. from the Islamic State group. But he said the militants can become a serious threat to the homeland if they are allowed to control even more territory and amass more financial and other resources, including foreign fighters.